Final answer:
The correct word to use in the sentence is 'effect' because it refers to the result of fishing on Aardvark's mood. 'Effect' is a noun, whereas 1)'affect' is a verb that means to influence or alter.
Step-by-step explanation:
Squiggly marveled at the1) effect fishing had on Aardvark's mood. In this context, you would use 'effect' because it refers to the result or outcome of an action.
The word 'affect' is a verb meaning to influence or make a difference to, while 'effect' as a noun refers to the change itself that was produced by an action.
The difference between affect and effect can be confusing, but a simple way to remember is that 'affect' is usually a verb and 'effect' is usually a noun.
For example, 'The wine affected me, but it seemed to have no effect on my roommate.' In this case, the wine produced a change in me (affected), but the result (effect) was not evident in my roommate.